“Intruder approaching silently is unexpectedly scared off with a big BANG!!
• Mr Nobody "shoots" at intruders without a gun.
• Protect people & property.
• Safeguard common entry / escape routes.
• Can help as early warning at long perimeter fences or borders.
The BangPen is a device with a tripwire and a shotgun primer to keep out illegal trespassers and intruders in remote areas. The tripwire can be set in the length or direction you choose!”
http://www.unsecpro.co.za/index.php/...s/the-bang-pen

1. Is it legal?
2. How could one buy shotgun primers without shotgun licence?